Between then and now, between the Renaissance and nowadays, Leonardo da Vinci and his genius continue to animate the pages of the new book written by Giam- paolo Guida. Leonardo again; his astonishing alchemical virtue, his pictorial work and the consequences in the history of his presence in Milan at the end of the fifteenth centu- ry interwine with new enigmas and mysteries in a development with a rapid pace. Desire for knowledge...